Wrought-metal pipe.



No. 682,026. Patented Sept. 3, I901.

R. BUNGEBOTH.

WBUUGHT METAL PIPE.

(Application filed May 11, 1901.)

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RUDOLF BUNGEROTH, OF DUSSELDORF, GERMANY.

WROUGHT-METAL PIPE.

SPECIFICATION forming part of Letters Patent No. 682,026, datedSeptember 3, 1901.

Application filed May 11, 1901. Serial No. 59,845 (No model.)

To all whom it may concern.-

Be it known that I, RUDoLF BUNGEROTH, a subject of the German Emperor,residing in Dusseldorf, Germany, (whose post-oflice address isAdersstrasse 36, in said Dusseldorf, Germany,) have inventedImprovements in Wrought-Metal Pipes, of which the following is aspecification.

My invention relates to that class of wrought-metal pipes or tubing inwhich rims, shoulders, or flanges are formed at the ends of the pipes bydoubling the metal on itself, such rims serving with packing andsuitable fastening means to form joints with adjacent pipes.

The object of my invention is to so construct a pipe or tube of thischaracter that it will not break or give way at or near the rim, as hasbeen often the case.

In the accompanying drawings, Figure 1 is a sectional view of such pipeends as ordinarily formed and combined with joining means. Fig. 2 is asectional View of a pipe end prepared for the formation of a rim orflange according to my invention, and Fig. 3 is a sectional view of twoflanged pipe ends according to myinvention and joined together by meanssimilar to those shown in Fig. 1.

In Fig. 1 the end of each wrought-metal pipe Ct is doubled, as at b, toform a rim or flange, and an annular groove 1* is formed in the face ofthe flange for the reception of the packing, and rings .0 c are put onthe pipes behind the flanges b, and bolts and nuts d applied to draw theadjacent ends of the pipes together to make a tight joint. It has beenfound that such doubled flanges are liable to break or give way or eventear off under strain, particularly on the line 00 0c, the point oftransition from the cross-section of the pipe to the cross-section ofthe rim or flange, and this is because the cross-section at the point xm is subjected to disproportionate and opposing strains in thedirections of the arrows. These strains may be produced by unequaltightening of the bolts 01 or by jarring of the fluids in the pipes,where high pressures are used, or by expansion and contraction underchanges of temperatures. To prevent this trouble, I make the pipe endsin the manner indicated in Figs. 2 and 3. As shown in Fig. 2, I thickenthe end of the pipe outwardly at a by upsetting,for instance, the lengthof this thickened part being sufficient to enable the required doubledrim 1) to be formed and yet to bring the thickened part at the point 03'00', where the cross-section of the pipe passes into the cross-sectionof the doubled rim. In this way I can make this normally weak point a:a"; so strong that the pipe will tear at its normal cross section soonerthan at the point a; m.

' I claim as my invention- 1. A wrought-metal pipe having a thickenedend on which isformed a doubled flanged rim, as and for the purposedescribed.

2. A wrought-metal pipe having its end thickened outwardly and a doubledflanged rim formed thereon, as and for the purposes described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

RUDOLF BUNGEROTI-I.

Witnesses:

P. LIEBER, WILLIAM EssENWEIN.

